As mentioned, a good email list, well run, can grow your reader loyalty. Hearing from you again and again with good content reminds readers of your value, especially if they take your advice and find it works for them. That said, the obvious reason why most people try email marketing is because it is profitable. This is because of the following attributes:

• Low Cost - Communicating via email has many of the advantages of traditional direct mail but with much lower costs
• Speed - If you need to you can get a message out to your entire list very fast
• Ease (both for you and the reader) - For your marketing to be a success it has to be easy for the recipient, but it helps that email marketing is easy for you too as it means you can do it yourself
• Push - While websites and RSS are "pull", in that the visitor has to come to you, with email you can send your messages out, reminding and re-engaging readers
• Personalised - The more information you collect, the more messages can be tailored and personalized. Email also has the particularly special ability to segment, meaning you can split people off into smaller, more focused lists
• Viral Marketing - It's so easy for people to forward your message on to others, spreading further than you could alone
• Tracking - Everything from how many emails were opened, through to each individual link click can be tracked, meaning you can hone your techniques and improve performance
• Testing - Along with tracking, you can test different subject lines, calls to action, use of images, and so on, to further improve your results
• Complimentary - Email, while an excellent tactic, does not replace your other marketing activities but compliments them extremely well. Combining multiple tactics can build very profitable marketing campaigns
• Opt-In - Perhaps most important, the best email lists are always opt-in, meaning you have permission to contact the person. This permission is very powerful and should not be underestimated